The case raises issues about privacy and the government use of informants. If a customer turns over their computer for repair, do they forfeit their expectation of privacy, and their Fourth Amendment protection from unreasonable searches? And if an informant is paid, does it compromise their credibility or effectively convert them into an agent of the government?
Best Buy spokesman Jeff Shelman … “Any circumstances in which an employee received payment from the FBI is the result of extremely poor individual judgment, is not something we tolerate and is certainly not a part of our normal business behavior.”
Source: If a Best Buy technician is a paid FBI informant, are his computer searches legal? – The Washington Post